The position of the
slope of the transmitting pulse (Nullpunkt) at the circular time base (TP, see below), determines the
accuracy of the Würzburg coarse range finder. The range-scale is engraved inside
the (flat) glass screen of the LB13/40 CR tube in the ANG 62 display unit (equally
in all Würzburg radars since about mid 1942; FuSE62 / 65 - FuMG62 / 65 sometimes known as FuG62 / 65)(65
= Riese- or Giant Würzburg).

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This photo is copied from the
Rehbock contribution on this website. For us relevant is:
the position of TP (transmitted radar pulse) versus the engraved range-scale (for
details see
Deckname Würzburg page
10). The circular time base-line is
generated in a resonant power amplifier. The two deflection yokes are both in
resonance, though, with a phase difference of 90° at 3750 Hz (PRF). The nature of this circuit
does not allow directly accurate phase fixing (in the time-domain, at
what angle the rotating light spot actually is). TP could deviate into either direction. As
the time base has to be in accordance with the engraved range-scale, it is obligatory
to check the correct position of TP regularly.

The central
module IG62 (Impulsgerät) is the pulse modulator of a Würzburg installation.
Right of it five automatic fuses (AF, see below)

IG62 without
cover (all valves are type: LS50)

The second step
is to remove (pulling out) LS50 number 4 (Rö = valve). Hoffmann-Heyden
mistakenly
mentions in his book, that it should be Rö 5, which is not correct.

The dummy
base pointing to the left, has (now) to be inserted into the empty valve socket 4. On
the right the small (self-made) antenna.

NEG 62 in
position. The third step is: to activate the automatic fuses (AF buttons 1
- 3). The two lower fuse buttons 4 and 5
respectively could activate the - 2700 and + 8000 volts supplies. The pulses at g1 of
valve 4 triggers (see Na-Liste
last paragraph) the oscillator circuit of NEG 62 (see details
below); CR is part of the fine-range crank of EAG 62 (regard for details my book
Deckname Würzburg); CC
is pointing to the coaxial-cable-input of the intermediate amplifier ZFV 62 (box
with red K) and the small antenna radiator of NEG 62 (inducing so a small amount
of energy into the IF amplifier); CR Tube LB7/15 (Opta) is
for checking either the
transmitting pulse (Tastimpuls) or the receiver blocking pulse (Sperrimpuls). During operation
it is normally switched off; TL is the output for: Tastlaus (pulsed coherent
signals, like Tastlaus or Pulsed-Doppler detection, etc., regard
Deckname Würzburg); FC is the flat-cable
interconnecting the main panel with the displays for: fine ranging EAG 62 and
coarse measuring ANG 62. Regard also: Würzburg set-up(new)

NEG62 without
cover. The coils L1 and L2 are silver deposit at ceramic bodies. The
antenna-plug is visible in front, on the left.

The trigger
pulse is derived from the g1 pin of valve socket 4 (LS50)

The circuit
diagram of NEG 62 Nashorn

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